Norman x



N. D. STURGES.

MOLD FOR CASTING BATTERY GRIDS.

APPLICATION FILED APR.24.1918.

Patented Sept. 30, 1919.

A TTORNEY ar ssa.

tilt

ofv one of UNITED STATES PATENT oFFioE.

NORMAN D. STUR GES, F BROOKLYN, NEW YORK, ASSIGNOR T0 MULTIPLE STORAGE BATTERY 00., A QOBCPORATION OF NEW YORK.

MOLD FOE CASTING BATTERY- G To all whom it may concern:

Be it known that I, NORMAN D. STURGES, a citizen of the United States, residin Brooklyn, in the county of Kings and tat/e of New York, have invented certain new and useful Improvements in Molds for Casting Battery-Grids of which the following is a full, clear, an. exact description.

My invention relates to the casting of lead grids of a kind suitable for storage batteries, my purpose being to facilitate the casting of a comparatively thin and light grid, free from blow holes, bubble pockets and similar defects due to practical difficulties arising from the presence of air in the castin dies.

My invention is of special utility in the matter of casting comparatively thin and frail ids, to be used 11]. making thin and light attery plates.

In casting such grids, and especially in instances in which the object is to produce exceedingly thin battery platessay one thirty-second toone-sixteenth of an inch in thickness-it is a very difiicult matter to cause the molten lead to flow properly into the various casting grooves intended for it, owing to the fact that these grooves are quite small and contain air, and that various bodies of this air are liable to become pocketed in and held by the molten metal. llf, now, ordinary air vents be provided to facilitate the escape of the trapped air, the molten metal tends to follow the air into the air vents, and thus give rise to other dificulties.

What I seek to do, therefore, is to provide casting grooves for receiving and retaining the molten metal, and also a number of air passages for receiving air from the grooves and for discharging the. air thus received. In doing this I give such form to the parts that while the air can find its way from the network of grooves to the various air ducts, the molten metal is unable to'follow the air and thus is unable to clog the air passages.

Reference is made to the accom anying drawing formin a part of this specification, and in which li e reference numerals indicate like parts throughout the several figures.

Figure 1 is a fragmentary front elevation casting.

Fig. 2 is a view, partly in elevation and partly in end section, of the mold complete.

Specification of Letters Patent.

my improved die plates used in Patented se aeo, 1919..

Application filed Apr1l24, 1918.. semi in. 230,433.

Fig. 3 is an enlarged section, on the line 33 of Fi 1, looking in the direction indicated by t e arrows.

The two jaws of a mold are shown at 3, 4, and are connected together by a bin e 5 in the usual or any desired manner. Two die plates are shown at 6, 7, and are removable independently of each other. These plates are preferably made of refractory metal, such as steel, but may be made of any other material commonly used in this art for analogous purposes.

Each die plate 6, 7, is provided with casting grooves 8, 9, 9, merging into each other and thus connected together after the manner of a labyrinth. Each die plate is further provided with air passages 10, disposed para el to each other and terminating in the open air. Each air passage 10 extends nearly the width of the die plate, and is spaced from the nearest adjacent casting groove 8, 9, 9 of the same die plate by a distance at least equal to the proximate thickness of the plate.

Each die plate is b virtue of the casting grooves 8, 9, 9 score ofi' into facets 12, and located in the center of each facet is an air hole 13, merging into and virtually form ing an extension of the adjacent air passa e 10.

ach facet 12 is further provided with a set of air ducts 14, each of the form indicated in Fi 3 and merging into the air hole 13 of t e same facet. That is to say, each duct 14 has the proximate form of a wedge, its deepest portion being where it merges into the hole 13, the duct becoming shallower as it leads away from this hole, the outer end of the duct terniinating short of the adjacent corner of the facet. There is thus left, in the corner of each facet, a distinct wall 15 of the die plate. This wall is for the purpose of preventing the travel of molten lead into the ducts 14 and the air hole 13, while allowing the air to make its escape, as hereinafter more completely described.

Each die-plate is further provided with an air vent 16, preferably branching in form, as shown at the left of Fig. 1. This air vent is merely to allow the free escape of air from the'mold, and particularly from; the outer portions thereof, in the usual or any desired manner.

The die plates 6, 7 are mates; that is, the

face of each die plate matches the face of the other, so that when the two die plates are. brought together, as Fig. 2, each facet is m juxtaposition with some other facet, and the various 'groovesof one plate are caused to merge. into corresponding ves of the other plate. Henceeach air from: A portion the air vent 16.

Most of the trapped a'ir, however, works its way out by creeping between the juxtaentering the air ducts'l and t ence pass ing through the ducts 14 and theair' Q a'ssages 10. p This part not be misunderstood. he air, does not rush freely from themolding grooves throu h the ducts 14, and into the air holes 13. at-the air does in this connection is to spread out into the form of capillary 12 and having; one that it gradually ga thers into the ducts l4, and thence flows mto' the holes 13',' .this action being faciligate holes 1 ,11; facilitate the introduction of the molten metal. The operation of my device is as follows:

The parts beingassembled and arranged as above described, molten lead .is poured into the mold and findsits way into 'thef casting grooves 8, 9 and}? and in so doing 4 tends to displacev the contained air thereof this air, located ,compara tively near the outside; of the mold and; easily expelled, is readily forced outthrough H 1 plate to a point flush with the surfacewith said facet, and further provided with an air u v, 4 fduct mergingiin'to sald air hole and exposed facets 12 of the two diev lates, and

of the am however, should tated by the-increasing depth of the ducts 14, reckonin fromthe outer. ends thereof and toward t e holes 13. The molten metal, however, is unable to pass the juxtaposed walls 15, and thus can not pass into the ducts 14. The point is that the air, by

virtue of its tm'obility, can spread out into and enter theair. holes 13, but that owi bilit and orer capillarity than air, is con ed wit n the casting grooves. wall 15 acts selectively and the lead.

I do not limit myself to the precise arrangement shown,

as variations may be Each as between the air a film and thence can gather itself together a e therein without departing from the v spirit of my'invention, the scope of which is determined by'my claims,

Iclaimz-j I 1. In a device of the character described,

a die plate provided with a facet and with jet a cast ng' roove bounding said facet, said.

die plate in further provided with an air hole exten ing through a part of said tending partlall across said facet,'for the v I purpose of enab g airtoesca e from said ole, inthef casting groove and ormed into a facet, said 4 portion having an air hole and .being proorder to facilitate the escape of air, travel- 7 ing in the form of a. cap llary film from ,said casting'groove into said air duct.

NORMAN STURGES.

.80 vided with an air duct interrupting said I U facet and merging into said air hole, in films, each of the roximate size of a facet 

